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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3df8b2dcf70ea7d5f2b431264f3fb61079d2faaf8003af45d8241712145246c' 
  AND token = 'ujHaT6pNyabI/MMh82h+g5/hZBpTa8Q5uV5oADM59MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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