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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2846de1f5ea0ce074fac320321cbde17169cee4a927d76aa19134fab6716f3' 
  AND token = 'smGKeK69wO4J9nFKlUzzUDDVb40KPsVTIqRE9ACKslg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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