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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8f7822f5889fcf5cedd798b8b2925d8bd14ec577e4908c78186264725b5c69' 
  AND token = '49zRw99dmyMDF47HTPUHri/nrZ5621z2LpEsUB7MiRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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