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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1522b016576b7ee4b2d6f6c4c62d311cb942df2c083498532d753aba07cfc4' 
  AND token = 'FoSMy63ynxrtonT+TJTfRlbSkK3SCNKww23WX3fVXk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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