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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fca1d032f9adc06951da3e8076997264361032adc59fa78eff91ab455b37f5b' 
  AND token = 'iHxxGsioDNrELnC4b36JxW+KKyUIvdWEJAQPcP5KhdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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