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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd3a3162893ad62a1651f53a44f2e50fe73f22f0ceac22773cb3aa469cfe0b8' 
  AND token = 'TqnLAphErTxotcIeh6/I6wuSbyF0sCKZrLlb2Eb1T2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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