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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e7647f739b5005af2dce719a18f6b08e894785aa448dc2499bcbb2dbe7b815' 
  AND token = 'eBa79VP1/a/bWgJGN2wyJOtu18GUJHsIRz6CEA/qW9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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