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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b532c6b175356fa7da6162bf6e4e0281bd89a0f595ff989f9d22a5752791e90' 
  AND token = '9CCySczH6M9W9Tj7BtN+hO1uqxkujV9f0WQFeLyeynw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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