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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5947089c2741d463a40a968d31eefa12201858071380d65eadc00bca845f8894' 
  AND token = '7HuxeZtLnAhsfTLV5rRZ4Wj/MvkK+eR8n0Ko+AekuA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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