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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf135d6ef364fa4de511a4805e24b66e7ceaeb5507a0d59ff03888da2d97bad' 
  AND token = 'HUaBdYbhuQn9y+TbzuaheLhrwj5zUb1tMmQ6Kl0+HOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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