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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c741d9fa9f37c256a2253f926db8b9c828f7dcd31e0f18bba9c3dfb6f1032f64' 
  AND token = '87cPYon7QOooooo7JecvBypptYPEAu/TM1rio1vq6zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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