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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ce701d5df6226f74552c1a07bf9028a0e79a2e4c42f5a5571665547fc86930' 
  AND token = 'tL0vSyhiXJEhTqDrH3tpMw7YxX+jdF8aOnZJohLbsAY=' 
  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"
    }
  }
}