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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff90a3eb6ea550a5b9365b11d9b21e53dde4d994131801164c65ed6170450a22' 
  AND token = 'Y8P8DX3RAYbJiuI8NMHuSolrLJBQxFS5mhU6VuyrPLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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