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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8670f983d06e90dc852616f0490350f2c726d8bad91a2168426f2ebc78f0c145' 
  AND token = 'ZKPnT5W1AxJzaO/Ph1wQuW/AONJN11OSjQuARly5Wow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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