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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbbf5ab8e6cd777c627bf9cc327c81427f80e7183855ee7717a0c99accd7a16' 
  AND token = 'b+9EBO/RBAgo+0wwmkRicYf80KcWDIaa9hb0GCzmRHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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