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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7765a73006df7049e3b09dde0d4a8b01432ff6d88ac86e2eefbc5f6d75f3cbc0' 
  AND token = 'ClVdPSj5wmDcTF3nIsYRZB3Cpe4uVzNm7Dfk02K3HPE=' 
  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"
    }
  }
}