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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4b3ec1efa0c64609e8dc32624bb1e8d3b3e01281c7b45689934ebc286f97d5' 
  AND token = '7qaGMbEjT9SW0pCYHbxELSptBTM9s3N6mKRxcAhJXmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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