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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b76d9f02de27e590dffa7478ec4037651548d0c389c34c778068e92dd5ee47b' 
  AND token = 'vK6StaPhRm/NNF5SUAwP3L+IJW0lx+zxcWg18oOk07Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01273

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}