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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e080b80deb070a8c4e1f1aff2f5f3def68d374088d84811211495db197e5d1' 
  AND token = 'w5yLyn8sU0jJ5e6ZhaugLV7v8Sp5pU4ZvSWoy7oo4bY=' 
  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"
    }
  }
}