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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b949ae83184b6edd463854c52f39b6eeca7ce6dbe9e59b1228d7e090b0e4362d' 
  AND token = '8fT9cvXyMi74GiCP2dpEGe0ETWvNxXrE/j10tmW0hYg=' 
  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"
    }
  }
}