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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc6e1d018ce2dd50a36aa14a1ce8d1ebbffbcc3ad01c7605a779e4998042d2b' 
  AND token = 'yOIl3Uitj9rarRENv7JEdBeaHYBDe8lfCYyRU73XAsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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