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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de9e1eee7743b9e64bea32b4298dfc3c08477020e657da0626f4ab924261c6' 
  AND token = 'XO/P4o/OyYP3PzYvWD8kud3cMfi8oQO/TfvK0qdBRlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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