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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b14db50f6ac81aea9158f255fde24e8e852fb23461d9ba76553877bcb4c28be' 
  AND token = 'AWK/3mKjgRO7z9PllyLS5OmW6dTf6cJS+82Hdc9HT58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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