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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf81a075086e17acc68c59eecbe060d6630a5aa3c0d4b5153cb94e71aa2d9b5' 
  AND token = 'wudMZTkrbG+mf7SZ0f0bjgr22g2x6bZVKyzaU1IdiTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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