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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80ad1a7b62f20735915b70c7443ec63947a1d4873e7cdd7ced6e44f80a36619' 
  AND token = '/3zZkNxi7HvLXmcmFbnj6FEpkzUb6GIOKISvpYYa4sQ=' 
  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"
    }
  }
}