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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce312a3ad3b4073fbd82ef52d67265f665b5b1e94b4ee05bc612bd8f1c3e2ab' 
  AND token = 'gf+n2NNeLP6yCz6ZlTR58rb4f+h9hNWAvS5afdp2k1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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