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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f809e5fb6578105e1f50207976449213538d7a19e5c0cbbb2a33692010167f1b' 
  AND token = 'RxLaPQ0N7+BGMt+73d+Q1B+ykatv7uRuJXJtLXP2kSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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