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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309ffaf179fed51b1dd370e504f37c0235d66df2d5df8637a3486eafe2f3c34c' 
  AND token = 'IY1pc3dcFmkObTwUHPEM9meoUepNSW9Vbp7mTyPWq3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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