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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10a910278fcb388de6ccdab3e0667a1cd1e3a5257322e524925f20ad9587075' 
  AND token = 'eMET9hoDLXdrJ4/+ZurTwZEpbP4MTLrBmhasguQw6cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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