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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745ef77fa3e2c94d19ed6f7c8b8a1d83015822908d1ea42111eb1c2b7c7430db' 
  AND token = '4HtRXmgKiiPBy8GGogu0OmW7eVYfobvmPHlWEYNc2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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