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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a1bfc53cfc769ba05ce5ae8669ee2e4fe1c2b0e9feed1357bb8e82dd27b010' 
  AND token = 'wqgMa161ohV8UgoRO4bayN7WRVYh3ZCNDTb+HgJAZIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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