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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e963d573f9d9ef43fe5872c445a706213846ef254d05fd7479919b32883521e1' 
  AND token = 'P4cmruG8G5fiigSSzlXHIwIuzuc4otC7oF8GhTVM+CA=' 
  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"
    }
  }
}