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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566bb0dfb34aba6c1d8539d6c65bab8b44f27d6e13b208629c009eaba7cbb74f' 
  AND token = 'Te9y7921Dw3DOO0mRFnkl7u9N21xSjh9RMwo/L+lEtk=' 
  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"
    }
  }
}