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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c544403ec2d74811fad4554fd09e42f0f979bf816cd19023532c4b18ba934cd8' 
  AND token = 'HV5AJ1i2X68hukEE9fIaWfkB2Ox/PThIhHe4YlN9EWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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