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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf402d0ff22bd822abc1c062e347d3a2759f73a17932d27d1b5bd2c1d9ca1304' 
  AND token = '6dN0tJe0gBi4N0JZmej9mx56vy5aPuQWFnEXvNYcpOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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