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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1f2e1fd6bb2ce3820623cc084e90e279cb6810a71174d859b16672394b0b7e' 
  AND token = '0ePZdklbwAkltHzV9IYxwPU2W9CnYq3p2dl03zRlKuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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