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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61470234af3c843f1fc5e4b4f7152b48ad97c5ed41be39d07ecb45ed6967eb53' 
  AND token = 'MAJawV+8ypP4AJw7FGY2BQzQB6FpmU+tx7h4Us6dfiY=' 
  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"
    }
  }
}