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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c9759840ef13ad5b37574a977e9cd2a0155ac24652589fc88549c4928674a3' 
  AND token = 'jbClcBB0Ai926UfW7mkmO6cF3blnwUaNZIWA3lGQ4bs=' 
  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"
    }
  }
}