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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bd7d85a2086cb1c74977709295be75ccc3fd34ca7de859dbe7376a70830b1c' 
  AND token = '8INq4yX+qw3ltR3Dttc93EYoo23NVRcpFBTzyW8Oa4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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