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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea1b1e37fed266a98390386fd92cd16c64f50c505263cb5bade0508d0694c8f' 
  AND token = 'saTAYj7JRAzpFXI6j+LeLPXp7cS88t+jFDEOEf2+xPo=' 
  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"
    }
  }
}