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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd71a4c98d85c34b615ffb2d6221a2510bd42231b98b2e52c552f5052031ff58' 
  AND token = 'dbTOOEEpOOA7RVwKMuvGZBknaleyZmaTS+uyu8LL/5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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