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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2ec40894e9a7b9e529bbb259f3a1812faa4fbd4aa18bc79ed6f87b9946a28b' 
  AND token = 'DUcK8C0L3hPDcDlf0C7uSrs6Gp9xkVhuEKFhUUZuXgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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