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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ea7b6f7d76d13dc8f4cdd93980c9bdf8f868deeb97c76485b4ba359a82bee8' 
  AND token = '9h4iqxT4f3veuSpXeFlyHmTSPkkLV7tRQAl8FJn+ifU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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