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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e950195fa0db1089b4a5b9da6757a8f9ae871adb38d3c57d956dad934d07e245' 
  AND token = 'kKQn8LA38NX3N7ONsnlsvgPg4Ddzp39+UHWLmu0fRIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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