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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9f968d71c1160849b961d5a1f376c4cd7318a81a12916368165e32dde3a81' 
  AND token = 'upWy3EkQCkLAVHYxVAYz20Pj1Y+3Mh7X7ZC11D8d6NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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