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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4392f109b7cc2b2c2832aa9e8b07128b0998fcc99d2cf0cc00f3cddb60989453' 
  AND token = 'MWuDtVmqXfl4ynd0+3ko32F5NQXAAMqkvbNv2HvU7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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