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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464876549c43790afa6d3e1cb86fa07942e8f5f028a4c0885a4e3fcedda1ff58' 
  AND token = '1pzZBWjmYg2+SxytXAL9ol73EMXjaZmZHVb02lt/Lns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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