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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1b9d9afe1750e6790846f69c3ebf6fcf1f5253c82f5356c444b52e2b2ca66c' 
  AND token = 'IZglXdGpI48UO7xkl4doNuEQvPbi1mweEi8+Wv3M9Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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