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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bcac7226815dfd4d6d7d73a29ee360372df935639bb7c2b61b622a065c2d84' 
  AND token = '+ZAsTM7Oe4EQ//uvmf06jUgWuyFqM2dME7BqJX5Yx/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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