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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b05c1750601e2c87995a68faf1f7f627f0342d18870ba418f3a595baa9cd28b' 
  AND token = 'hp3cy4tOUfRc6xWER3T03EWULEvq1gjgeAESOvZ2aDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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