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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c23f0a31b94a947a349eb3053795c1399ab311befb9af672d419a13af7b63a' 
  AND token = 'wtjW8GMm/t/+F4RcGP2BLejK7N7bl7+Wxlr5T/aYpQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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