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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6d86df9eda81c6610776fedc62f6a9d0ff0c22800cec5a997de284e85f4bc1' 
  AND token = 'a7oTy7KYneu+KPdtKDqTHDfnAPOyVVZ95AzmRMF571E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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