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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f9a910826c2b4f6d99b0c59c96f5d56c926dca7a3b31649d06ec249ad6ca28' 
  AND token = 'WcNyZqUn1eM+qF17A2UHu0yEXm7o++yX3UT4CvTKHCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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