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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd01000e84d20466ee6c53144ce1aefad1c8f9bf1d8d06065f6ae2de41b77e6c' 
  AND token = 'jarhE17x9HGYf+3266ZQFJdb14fCfz1YwSVVBzWP/b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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