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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d61851ab321ab7e64a0cbcd6c075ec689f46c9e49ca37b2a515e5416ef60312' 
  AND token = 'vYeX+a3IyLEuKiTAMbcDufXb3rAyRmJGKG7SOGYJNZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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