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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3717604c731991bc2f7c4197249b3de47003fe4b74053694b82020841b7ae20d' 
  AND token = '2BdRdkMFqS3gwlYvuAVZLuBgqetW4w6L+QLMhsaEPi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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