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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb68299a6b71e0533709b05ffa842875218fe7b8be4401ffb6e98fc11ac9fa7' 
  AND token = '60zx93zaFFvaWAzzX1XNBwrucIUDk/TYd3m/O0iGluY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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