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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f313cd2f03849ca060f5238094669ad5a57d9a0e608417c718a2ef745142ae6' 
  AND token = '6dQ7TRnh8yZM5kwmneJ6yghOPaGDqd0wU1BDCirdfkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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