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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0c3b828d9059ad774c7a8a0b54990ff1db208f67ca39907fd5687110b1dd51' 
  AND token = '3/7YJe7jVYbmQJAyDc+Ybdf1qniWwNZN/nWz1jXw5ss=' 
  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"
    }
  }
}